Ramification Type for Rational Maps

[Andrew O'Desky]

Implement a method which returns the ramification type of a rational function. The ramification type is a list of lists of integers >1 defined by the pseudo code

def ram_type(self):

ram_types=list() for b in self.branch_points():

ram_inds=list() for c in F.preimage(b)

ram_inds.append(e_self(c)) if e_self(c) >1

ram_types.append(ram_inds)

return ram_types

[Andrew O'Desky]

New commits:

​feac5a3

Added ramification_type().

[git]

Branch pushed to git repo; I updated commit sha1. New commits:

​ed31de8

Changed factor to be called on the function and a typo in the doctests.

[git]

Branch pushed to git repo; I updated commit sha1. New commits:

​b9b2029

Updated doc to include an example with the embedding specified for splitting the Galois orbits of critical points.

[git]

Branch pushed to git repo; I updated commit sha1. New commits:

​f7ec202

Made the ramification type compute over a sufficiently large field by definition.

[Frédéric Chapoton]

reviewer name missing

[Volker Braun]

Merge conflict, please fix

[git]

Branch pushed to git repo; I updated commit sha1. New commits:

​5dde8f0

Merge branch 'u/gh-aodesky/ramification_type_for_rational_maps' of git://trac.sagemath.org/sage into 28753

[git]

Branch pushed to git repo; I updated commit sha1. New commits:

​0160c01	Merge commit '296b749a019a0365169fe82b5e0859502af909b3' of git://trac.sagemath.org/sage into 28753
​fa92c61	Merge commit '485ed39a9482fb8336f58c778f2f6a0f847b7caa' of git://trac.sagemath.org/sage into 28753
​ddb7200	Merge commit 'e5b1ca33870046f4ed9bc5a3a4561fec54b54b3b' of git://trac.sagemath.org/sage into 28753

[git]

Branch pushed to git repo; I updated commit sha1. New commits:

​0a97a35

Merge branch 'develop' of git://trac.sagemath.org/sage into 28753

[Erik Bray]

Ticket retargeted after milestone closed

[Matthias Köppe]

Batch modifying tickets that will likely not be ready for 9.1, based on a review of the ticket title, branch/review status, and last modification date.

[Frédéric Chapoton]

I have fixed up some details. Now somebody else should switch this back to positive review.

---

New commits:

​daab1f2	Merge branch 'u/gh-aodesky/ramification_type_for_rational_maps' of ssh://trac.sagemath.org:22/sage into ram_type
​f00e3e8	fixing up details

[Travis Scrimshaw]

LGTM.